Exciton g-factors in monolayer and bilayer WSe2 from experiment and theory

Förste, Jonathan; Tepliakov, Nikita V.; Kruchinin, Stanislav Yu; Lindlau, Jessica; Funk, Victor; Förg, Michael; Watanabe, Kenji; Taniguchi, Takashi; Baimuratov, Anvar S. und Högele, Alexander (2020): Exciton g-factors in monolayer and bilayer WSe2 from experiment and theory. In: Nature Communications, Bd. 11, Nr. 1, 4539

Abstract

The optical properties of monolayer and bilayer transition metal dichalcogenide semiconductors are governed by excitons in different spin and valley configurations, providing versatile aspects for van der Waals heterostructures and devices. Here, we present experimental and theoretical studies of exciton energy splittings in external magnetic field in neutral and charged WSe2 monolayer and bilayer crystals embedded in a field effect device for active doping control. We develop theoretical methods to calculate the exciton g-factors from first principles for all possible spin-valley configurations of excitons in monolayer and bilayer WSe2 including valley-indirect excitons. Our theoretical and experimental findings shed light on some of the characteristic photoluminescence peaks observed for monolayer and bilayer WSe2. In more general terms, the theoretical aspects of our work provide additional means for the characterization of single and few-layer transition metal dichalcogenides, as well as their heterostructures, in the presence of external magnetic fields.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Physik
• Fakultätsübergreifende Einrichtungen: Center for NanoScience (CENS)
• Themengebiete: 500 Naturwissenschaften und Mathematik > 530 Physik ; 500 Naturwissenschaften und Mathematik > 500 Naturwissenschaften
• ISSN: 2041-1723
• Sprache: Englisch